Mayhem reigns supreme in the animated kingdom as whiz kid Jimmy Neutron and Timmy from "The Fairly Oddparents" swap places in each other's worlds. Mayhem reigns supreme in the animated kingdom as whiz kid Jimmy Neutron and Timmy from "The Fairly Oddparents" swap places in each other's worlds. Mayhem reigns supreme in the animated kingdom as whiz kid Jimmy Neutron and Timmy from "The Fairly Oddparents" swap places in each other's worlds. Mayhem reigns supreme in the animated kingdom as whiz kid Jimmy Neutron and Timmy from "The Fairly Oddparents" swap places in each other's worlds.